2. Northeast Quadrant (NE): Fastener Diameter and Head Placement
By condensing critical manufacturing data into a standardized quadrant-based symbol, the NAS523 code minimizes errors in fastener selection and installation. It serves as a vital bridge between engineering design and the shop floor, ensuring that every one of the millions of fasteners in an aircraft meets precise safety and performance specifications. Detailed guides and PDF charts for these codes are frequently used as AVAM Class Notes or reference materials by Aircraft Maintenance Engineers (AMEs). NAS523 Rivet Identification Guide | PDF - Scribd
The symbol consists of a central crosshair forming four distinct quadrants. While the compass directions (Northwest, Northeast, Southwest, Southeast) are never explicitly written on the drawing, the layout always follows this strict orientation: Quadrant Location Technical Designation Data Contained Northwest (NW) Fastener Basic Code & Material (e.g., BJ, BB) Top-Right Northeast (NE) Shank Diameter & Manufactured Head Location (Near/Far) Bottom-Left Southwest (SW) Hole Preparation Code (Countersink/Dimple) Bottom-Right Southeast (SE) Fastener Length (measured in -inch increments) Deep Dive: Deciphering Each Quadrant 1. Top-Left (NW): Fastener Type and Material
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Useful for IT professionals who need the exact hardware specs, such as the Dual Core 1.3 GHz CPU and DDR3 RAM capacity. Key Technical Insights from the Manual nas523 pdf top
The NE quadrant states the body diameter of the rivet shank, usually measured in increments of 1/32 of an inch. Right next to the size, it lists a letter denoting the position of the manufactured head:
(crosshair) symbol. The intersection represents the exact location of the fastener. Detailed instructions are provided within the four quadrants of this cross: Course Hero Specification Upper Left Rivet part number (e.g., AN or MS) and material code. Upper Right
: Place the manufactured head on the surface closest to the person viewing the diagram.
Standardization also ensures structural integrity by guiding technicians in selecting the correct alloy. Rivets are identified by markings on their heads, such as a single dimple for 2117 alloy ("AD") or double dashes for 2024 alloy ("DD"). Some high-strength "icebox" rivets (like D and DD types) even require heat treatment and refrigeration before installation to maintain their structural properties. Conclusion Detailed guides and PDF charts for these codes
Once driven, quality control inspectors verify the bucktail aligns with these minimum dimensional footprints:
Because full part numbers like MS20470AD are too lengthy for a schematic diagram, NAS523 substitutes them with a standardized .
If you are a supplier for Boeing, Lockheed Martin, or Airbus, check your supplier portal.
Rivet diameter (in 1/32" increments) and head location (Near/Far) Lower Left Top-Left (NW): Fastener Type and Material This public
For an accessible breakdown including full material code matrices, check the Scribd NAS523 Solid Rivet Specifications Sheet . It provides a 10-page text and visual reference detailing exactly how to use the quadrants alongside practical math calculations for shop head inspections (such as ensuring a driven shop head is in height and
| Revision | Year Released | Key Details | |---|---|---| | NAS523-1993 (Rev 28) | 1993 | Early version of the fastener code standard | | NAS523-2007 (Rev 29) | 2007 | 72-page document addressing fastener coding | | NAS523-2013 (Rev 30) | 2013 | Expanded specifications for aerospace applications | | NAS523-2014 (Rev 31) | June 2014 | ; supersedes all prior revisions |
Features a raised dot ; requires heat treatment ("icebox" rivet).
The code specifically applies to fasteners that are permanently deformed during installation, meaning they must be destroyed to be removed. Locating Points: